When I was working on a project, I encountered a scenario where there were two tables with a data volume of around million. Now I want to merge these two tables into one table in the production environment, I originally wanted to use the SQL statement insert into select for implementation. Later I found that this operation was slow because of the computing logic. The approximate table structure is as follows:
Table1
Id tel credits1
Table 2
Id tel credits2 points
The merged table is
Tab
and then send a cookie to the server---> return page information. Get the data to the score page and use regular expressions to take the scores and credits out separately and calculate the weighted average.
OK, it looks like a very simple kind of paper. Let's try it down there.
But before the experiment, there was one more problem, that is, where is the post data sent to?
Then look at the original page:
is obviously implemented with an HTML framewor
-repetitive domain.
Note: The 1NF field cannot be divided.
Example of 1NF non-conformity:
Student ID
Name
Age
Date of birth
Parents
Course
Credits
Score
Level
001
Zhang San
20
1996-02
Parent: Zhang Wuji,Mother: Han Meimei
Mathematics
5
80
Good
When you observe the table above, it is easy to find that the parent can be divided into the parent and the m
.)■ You are a teacher and need to know the credits and attendance information. Each time you take a test or test, you must record the credits of the students. It is easy to write your exam scores in the workbook, but it will be difficult to use it later. Therefore, when the final score is not determined for the term, you would rather not sort credits than summar
) + 'job=see=Name=Course=ClassID=Term=StuID=' + num
Similarly, the Post method is used to pass data and obtain the response content:
score_response = sessions.post(score_url, data=score_data,headers=score_healders)content = score_response.content
Here we use Beautiful Soup 4.2.0 to parse the returned response content, because we want to get the results. here we go to the academic performance query page to view the obtained results in the form of a table on the webpage:
Observe the webpage source
the data on the score page and use a regular expression to separate the score and credits and calculate the weighted average.
OK. it looks like a very simple sample. Next let's try it.
However, before the experiment, there was another problem that had not been solved, that is, where did the POST data actually be sent?
Let's take a look at the original page:
Obviously, it is implemented using an html framework. that is to say, the address we see in t
a teacher and need to know the credits and attendance information. Each time you take a test or test, you must record the credits of the students. It is easy to write your exam scores in the workbook, but it will be difficult to use it later. Therefore, when the final score is not determined for the term, you would rather not sort credits than summarize the
Title Description DescriptionThe school implements the credit system. Each compulsory course is subject to a fixed credit and must also receive a corresponding elective course credit. The school opens an elective course for N (nIn elective courses, some courses can be directly elective, some courses require a certain amount of basic knowledge, you must choose some other courses on the basis of the optional. For example, "Frontpage" must be elective after "Windows Operational basics". We call the
8. View the Exhibit and examine the structure of the CUSTOMERS table.Which both tasks would require subqueries or joins to being executed in a single statement? (Choose.)(Test instructions: The topic gives a Customers table.) Ask which two tasks to run in a statement requires a subquery or a connection statement. )A. Listing of customers who does not has A credit limit and were born before 1980B. Finding the number of customers, in each city, whose marital status is ' married 'C. Finding the ave
11.1apps that unlock or enable additional features or functionality with mechanisms other than the App Store would be reje CTED (apps that unlock or turn on additional properties or features through a channel other than the App Store will be rejected.) )
11.2Apps utilizing a system other than the In-app Purchase APIs (IAP) to Purchase content, functionality, or services in a N app will is rejected (using a system other than the in app Purchase API (IAP) to provide purchased content, the app f
There were a lot of things out of school last semester, so I chose fewer classes at school than I did before. Two weeks after the start of the school year, I dropped a lot of courses, and I paid a few more in the middle of the school year. In the end, I had to take 16 credits for the whole semester. In these 16 credits, I have basically never been to 13 credits o
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1. Official Website addressHttp://www.highcharts.com/
2. How to modify the source code of copyright informationIn highcharts. js, press credits to change the enabled attribute from true to false. If the code is compressed, it is caused! Change 0 to 0.
3. Official learning example addressHttp://www.highcharts.com/studies/4. Official APIHttp://api.highcharts.com/highcharts5. Common parameter configurationsChart. e
(Monte Carlo) Integration
CSource code: # Include
# Include
/* Srand (), Rand ()*/
# Include
/* Sin ()*/
# Include
/* Rand_max */
Using namespace STD;
Double funcone (Double X );/* Accumulate a metafunction */Double Monte carloone (double (* p) (double), double A, double B, double L, double H );/* Interface for calling one-dimensional function credits */Double functwo (Double X, Double Y );/* Product binary function */Do
Mac
OS
Python on X
In MacOSX, for python InstallationThere are two options: install or not install. You may want to install it.
MacOSX 10.2 and later versions have pre-installed a pythonCommand Line version.If you are used to using command line, you can use it to finish 1/3 of the book. However, the pre-installed version does not contain XMLParser, so when you learn XMLYou need to install the full version.
You can also install the latest full version of the GUI shell that is better than the pr
A website with more than 6 million users may generate up to 30 credits per day, for example, + 1, + 2, + 5. you can also generate several points, such as-50,-100. Is there any good solution to store the user's details of these changes? Mysql does not seem to be a good solution because data... A website with more than 6 million users may generate up to 30 credits per day, for example, + 1, + 2, + 5. you can
behavior of our components is: Membership Card swiping.
3. the hierarchical relationship between components, that is, the hierarchical relationship between stores. A main store can have a branch and a franchise store.
With these necessary conditions, my requirement is that the store is currently engaged in activities. When I swipe my card at the main store, I can accumulate the credits equivalent to the total cre
clustered index can be created in any column you want to create on the field, which is theoretically, the actual situation can not be arbitrarily specified, otherwise the performance will be a nightmare. Second: Why can a clustered index be created on any column, and if the table does not have a primary key constraint, it is possible that duplicate row data exists? In a rough look, this is really the same as the constraints of the clustered index, but the reality is that you can create a cluste
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